Groupon SA
Money not refunded to my Credit Card

I have been making use of Groupon since the business started a year or so back.
On the 11th of July I received an email from groupon, promoting a HTC phone. I looked at the ad and then bought the groupon by mistake. I immediatly emailed them, informing them of my mistake. They replied with the following...
Dear Customer,
Following your request, a refund has been made to your credit card.
Please allow for 3-5 working days for the funds to reflect.
Should you require any further assistance, please do not hesitate to contact us.
Regards,
The Refunds Team
Well, it's now the 29th of August, and after numerous emails, I still don't have the money paid back or any product. I have logged a case of at my bank.
The worst thing is, I have wanted to make use of groupon during the past couple of days, but how can I? When they are in fact my money???